<template>
    <div class="app-container">
      <!--表单-->
      <el-form :inline="true" class="demo-form-inline">
  
        <el-form-item>
          <el-select v-model="searchObj.type" clearable placeholder="请选择">
            <el-option label="学员登录数统计" value="login_num"/>
            <el-option label="学员注册数统计" value="register_num"/>
            <el-option label="课程播放数统计" value="video_view_num"/>
            <el-option label="每日课程数统计" value="course_num"/>
          </el-select>
        </el-form-item>
  
        <el-form-item>
          <el-date-picker
            v-model="searchObj.begin"
            type="date"
            placeholder="选择开始日期"
            value-format="yyyy-MM-dd" />
        </el-form-item>
        <el-form-item>
          <el-date-picker
            v-model="searchObj.end"
            type="date"
            placeholder="选择截止日期"
            value-format="yyyy-MM-dd" />
        </el-form-item>
        <el-button
          :disabled="btnDisabled"
          type="primary"
          icon="el-icon-search"
          @click="showChart()">查询</el-button>
      </el-form>
  
      <div class="chart-container">
        <div id="chart" class="chart" style="height:500px;width:100%" />
      </div>
    </div>
  </template>
  <script>
  import * as echarts from 'echarts'
  import staApi from '@/api/teacher/sta'
  
  export default {
      data() {
          return {
              searchObj:{},
              btnDisabled:false,
              xData:[],
              yData:[]
          }
      },
      methods:{
          showChart() {
              staApi.getDataSta(this.searchObj)
                  .then(response => {
                      this.yData = response.data.numDataList
                      this.xData = response.data.data_calculatedList
  
                      //调用下面生成图表的方法，改变值
                      this.setChart()
                  })
          },
          setChart() {
              // 基于准备好的dom，初始化echarts实例
              this.chart = echarts.init(document.getElementById('chart'))
              // console.log(this.chart)
  
              // 指定图表的配置项和数据
              var option = {
                  title: {
                      text: '数据统计'
                  },
                  tooltip: {
                      trigger: 'axis'
                  },
                  dataZoom: [{
                      show: true,
                      height: 30,
                      xAxisIndex: [
                          0
                      ],
                      bottom: 30,
                      start: 10,
                      end: 80,
                      handleIcon: 'path://M306.1,413c0,2.2-1.8,4-4,4h-59.8c-2.2,0-4-1.8-4-4V200.8c0-2.2,1.8-4,4-4h59.8c2.2,0,4,1.8,4,4V413z',
                      handleSize: '110%',
                      handleStyle: {
                          color: '#d3dee5'
  
                      },
                      textStyle: {
                          color: '#fff'
                      },
                      borderColor: '#90979c'
                      },
                      {
                      type: 'inside',
                      show: true,
                      height: 15,
                      start: 1,
                      end: 35
                   }],
                  // x轴是类目轴（离散数据）,必须通过data设置类目数据
                  xAxis: {
                      type: 'category',
                      data: this.xData
                  },
                  // y轴是数据轴（连续数据）
                  yAxis: {
                      type: 'value'
                  },
                  // 系列列表。每个系列通过 type 决定自己的图表类型
                  series: [{
                      // 系列中的数据内容数组
                      data: this.yData,
                      // 折线图
                      type: 'line'
                  }]
              }
  
              this.chart.setOption(option)
          }
      }
  }
  </script>
  